Red Hat Bugzilla – Bug 143498
nc not compiled with -DTELNET
Last modified: 2007-11-30 17:10:57 EST
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Description of problem:
The man page for nc documents a -t option to allow communication with
a telnet daemon. Currently, this option is not actually available
because nc was not compiled with the necessary option.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Run nc -h
2. Run nc -t localhost 23
Actual Results: Notice no -t option.
# nc -h
connect to somewhere: nc [-options] hostname port[s] [ports] ...
listen for inbound: nc -l -p port [-options] [hostname] [port]
-g gateway source-routing hop point[s], up to 8
-G num source-routing pointer: 4, 8, 12, ...
-h this cruft
-i secs delay interval for lines sent, ports
-l listen mode, for inbound connects
-n numeric-only IP addresses, no DNS
-o file hex dump of traffic
-p port local port number
-r randomize local and remote ports
-s addr local source address
-u UDP mode
-v verbose [use twice to be more verbose]
-w secs timeout for connects and final net reads
-z zero-I/O mode [used for scanning]
port numbers can be individual or ranges: lo-hi [inclusive]
# nc -t localhost 23
nc -h for help
Expected Results: One of the options should be for -t.
Using the -t option should work
Created attachment 108972 [details]
Patch to nc.spec to build with -DTELNET
This patch to the nc.spec file will build nc with the necessary option to
support telnet negotiation.
The support is added to nc-1.10-24.